MAKAROV, V. Supplement to the article by Douak and Maroni (2020) on a new class of 2-orthogonal polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 3, p. 200–205, 2025. DOI: 10.3842/umzh.v77i3.8898. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8898. Acesso em: 5 dec. 2025.